arch/arm/mach-s3c2412/gpio.c

   1 /* linux/arch/arm/mach-s3c2412/gpio.c
   2  *
   3  * Copyright (c) 2007 Simtec Electronics
   4  *      Ben Dooks <ben@simtec.co.uk>
   5  *
   6  * http://armlinux.simtec.co.uk/.
   7  *
   8  * S3C2412/S3C2413 specific GPIO support
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13 */
  14
  15 #include <linux/kernel.h>
  16 #include <linux/types.h>
  17 #include <linux/module.h>
  18 #include <linux/interrupt.h>
  19
  20 #include <asm/mach/arch.h>
  21 #include <asm/mach/map.h>
  22
  23 #include <asm/arch/regs-gpio.h>
  24
  25 #include <asm/hardware.h>
  26
  27 int s3c2412_gpio_set_sleepcfg(unsigned int pin, unsigned int state)
  28 {
  29         void __iomem *base = S3C24XX_GPIO_BASE(pin);
  30         unsigned long offs = S3C2410_GPIO_OFFSET(pin);
  31         unsigned long flags;
  32         unsigned long slpcon;
  33
  34         offs *= 2;
  35
  36         if (pin < S3C2410_GPIO_BANKB)
  37                 return -EINVAL;
  38
  39         if (pin >= S3C2410_GPIO_BANKF &&
  40             pin <= S3C2410_GPIO_BANKG)
  41                 return -EINVAL;
  42
  43         if (pin > (S3C2410_GPIO_BANKH + 32))
  44                 return -EINVAL;
  45
  46         local_irq_save(flags);
  47
  48         slpcon = __raw_readl(base + 0x0C);
  49
  50         slpcon &= ~(3 << offs);
  51         slpcon |= state << offs;
  52
  53         __raw_writel(slpcon, base + 0x0C);
  54
  55         local_irq_restore(flags);
  56
  57         return 0;
  58 }
  59
  60 EXPORT_SYMBOL(s3c2412_gpio_set_sleepcfg);